Serious enquiry about this.
Are you permitted to sue the MOD whilst a serving officer? Is it mutinous? If not, is it mutinous if 3 or more joined together to test the water in court? If not mutinous, would the old QR 1001 rear it's head? Would you be on duty in court, or on leave?
In fact, scrub that and replace with:
Can it be done and if so what is the procedure?